Research on the Effect of Wing Dihedral on Full-carpet Sonic Boom
Supersonic transport is one of the primary directions for the next generation of civil aircraft,but the sonic boom remains a key problem that restricts its commercial operation.However,most of the researches on low-boom design focus on the under-track sonic boom of the aircraft without sufficient consideration about sonic boom characteristics in the whole carpet.To address this problem,a study is conducted to investigate the effect of the wing dihedral on the full-carpet sonic boom characteristics.firstly full-carpet average boom intensity is defined.This physical quantity takes both the perceived level decibel and boom carpet width into account,which can be used as a metric of the sonic boom in the whole carpet.Secondly a rapid sonic boom prediction method is employed to investigate the relationship between the wing dihedral height and full-carpet average boom intensity.Finally,the sonic boom suppression mechanism of the wing dihedral and effects on near/far-field waveforms and ground loudness level are analyzed using Computational Fluid Dynamics(CFD)numerical simulations.Results indicate that dihedral wing can mitigate the shock intensity at all azimuthal angles below the wing,thereby resulting in a reduction of the sonic boom level across the entire sonic boom carpet.For the research wing-body configuration,a dihedral angle of 13.88° decrease the full-carpet average boom intensity by 3.23PLdB.
NETL
NSTL
万方数据
维普
